Bug 1849784 (CVE-2017-9107)

Summary: CVE-2017-9107 adns: out-of-bounds read when a domain ends with backslash
Product: [Other] Security Response Reporter: Guilherme de Almeida Suckevicz <gsuckevi>
Component: vulnerabilityAssignee: Red Hat Product Security <security-response-team>
Status: CLOSED UPSTREAM QA Contact:
Severity: medium Docs Contact:
Priority: medium    
Version: unspecifiedCC: rvokal, sergio, thozza, vonsch
Target Milestone: ---Keywords: Security
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Hardware: All   
OS: Linux   
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Last Closed: 2020-06-22 23:20:41 UTC Type: ---
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oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
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Bug Depends On: 1849785    
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Description Guilherme de Almeida Suckevicz 2020-06-22 19:37:55 UTC 
An issue was discovered in adns before 1.5.2. It overruns reading a buffer if a domain ends with backslash. If the query domain ended with \, and adns_qf_quoteok_query was specified, qdparselabel would read additional bytes from the buffer and try to treat them as the escape sequence. It would depart the input buffer and start processing many bytes of arbitrary heap data as if it were the query domain. Eventually it would run out of input or find some other kind of error, and declare the query domain invalid. But before then it might outrun available memory and crash. In principle this could be a denial of service attack.

Reference:
https://www.chiark.greenend.org.uk/pipermail/adns-announce/2020/000004.html
Comment 1 Guilherme de Almeida Suckevicz 2020-06-22 19:38:08 UTC 
Created adns tracking bugs for this issue:

Affects: fedora-all [bug 1849785]
Comment 2 Product Security DevOps Team 2020-06-22 23:20:41 UTC 
This CVE Bugzilla entry is for community support informational purposes only as it does not affect a package in a commercially supported Red Hat product. Refer to the dependent bugs for status of those individual community products.